[Android] Update OWNERS information (contacts_picker)

The Clank team is reviewing the ownership
of all `/android` directories and adding/updating OWNERS
as part of an effort to normalize code health metrics
across different data sources.

https://docs.google.com/document/d/1IYe0TIGAsJl-gZL39l31a2zUa_YasmcyfOIC-zllU_s

Bug: 1112872
Change-Id: I71fedd33bb14cb4a449db71c253bd48f23c20097
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2362632
Auto-Submit: Fred Mello <fredmello@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Commit-Queue: Peter Beverloo <peter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799618}

chrome/android/java/src/org/chromium/chrome/browser/contacts_picker/OWNERS

 finnur@chromium.org
 peter@chromium.org
-twellington@chromium.org
+rayankans@chromium.org
+
+# COMPONENT: Blink>Contacts
+# TEAM: fugu-dev@chromium.org
+# OS: Android
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